Seven letter words change one or two letter to make a new word

waffles

falafel

Efrafan

ruffian

(Good word)

BIP: Russian

Hessian

session

Thanks

mission

simians

miasmas

amasses

masseur

(Cool! we had a Russian/Hessian mission session)

assumed

(Red Forman: )

Dumbass!

embassy

amassed

damsels

tassels

lessons

sunless